Revert "Apply ruff/flake8-comprehensions rule C420 (pypa#13284)"

This reverts commit 0285e1a.

Author: ichard26

src/pip/_internal/locations/_sysconfig.py

@@ -161,9 +161,9 @@ def get_scheme(
         scheme_name = "posix_prefix"
 
     if home is not None:
-        variables = dict.fromkeys(_HOME_KEYS, home)
+        variables = {k: home for k in _HOME_KEYS}
     elif prefix is not None:
-        variables = dict.fromkeys(_HOME_KEYS, prefix)
+        variables = {k: prefix for k in _HOME_KEYS}
     else:
         variables = {}